139789728 has 72 divisors (see below), whose sum is σ = 428117508. Its totient is φ = 43011072.

The previous prime is 139789721. The next prime is 139789729. The reversal of 139789728 is 827987931.

It can be written as a sum of positive squares in 2 ways, for example, as 138015504 + 1774224 = 11748^2 + 1332^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (139789721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14925 + ... + 22412.

Almost surely, 2^139789728 is an apocalyptic number.

139789728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139789728 is an abundant number, since it is smaller than the sum of its proper divisors (288327780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139789728 is a wasteful number, since it uses less digits than its factorization.

139789728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37366 (or 37355 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 139789728 is about 11823.2706134978. The cubic root of 139789728 is about 518.9893189467.

It can be divided in two parts, 1397 and 89728, that added together give a cube (91125 = 45³).

The spelling of 139789728 in words is "one hundred thirty-nine million, seven hundred eighty-nine thousand, seven hundred twenty-eight".